21534873402 has 16 divisors (see below), whose sum is σ = 49222567872. Its totient is φ = 6152820960.

The previous prime is 21534873383. The next prime is 21534873499. The reversal of 21534873402 is 20437843512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256367499 + ... + 256367582.

It is an arithmetic number, because the mean of its divisors is an integer number (3076410492).

Almost surely, 2^21534873402 is an apocalyptic number.

21534873402 is an abundant number, since it is smaller than the sum of its proper divisors (27687694470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21534873402 is a wasteful number, since it uses less digits than its factorization.

21534873402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512735093.

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 21534873402 in words is "twenty-one billion, five hundred thirty-four million, eight hundred seventy-three thousand, four hundred two".